Telephone system



May 19, 1931. P. F. GUNNING TELEPHONE SYSTEM 2 Sheets-Sheet 1 Filed March 25. i929 Im reu 0r Percy Frank Bum-Lin May 19, 1931. F. GUNNING ,3

TELEPHONE SYSTEM v Filed March 25, 1929 2 Sheets-Sheet 2 PEI-T51 Frank Dunning patented May 19, 1931 =vwsmec PATENTMOFFTILCE' PERCY FRANK Genuine, or 'EIvEErooL, ENGLAND, ASSIGNOR 'ro Assocm rEn 'TEIQE;

cnrceeo; ILLINOIS, a CORPORATION 01 PHONE a TELEGRAPH COMPANY, 0 DELAWARE TELEPHON SYSTEM Application filed March 25-, 1929, Serial 1%; s49,eo4,ana in-Great Britain May 2a, 1925.

The presentinvention relates to improve ments in telephones systems and more particularly concerns semi-automatic telephone systems in which an'operator is enabled by means of a key set, to control the operation of automatic switches. to'establish connections with the subscribers! lines, though" it will be understood that the scope of :its application need notnecessarily be limited to the arrangement shown; I q

v In know-n circuit arrangements of this type,the operation of the digit keys by-the operator, in accordance with wanted subscribers numbers, effects the operation of certain relays, known as storing relays. The usual arrangement is that, for each vdigit,

particular 'relaysor combinations of relays in a group are energized, in accordance with the key operated and the contacts'ofthese relays are connected in such amanner that they control the subsequent sending of the digits As a result of this, each group of storing relays has to be provided with "a comparatively large number of springs, and as most numbering schemes require the sending of at least four digits,thetotal-number of contact springs on the relays becomes-unduly large.

The object of the present'invention therefore is to provide a simplified circuit which will enable the numberjof'spring-combinations tojbe considerably reduced, and according to one feature'of the invention this is accomplished 'by arranging that only the first storing group of relays carry the necessary spring combinations and connections, to control the sending. of the subscribers number in'ac'cordance with the relay, or relays operated; Relays in theother storing relay groupsonly carry sufiicient springs to control the relays in the first group, and-the relaysin the first group'release after the sending of each digit,-i-to be thereafter'reoperated in accordance with the setting-of the relays in each of the subsequent'groups.

The invention will be better understoodfrom the'detailed description of one method of carrying it-into efiect which follows,reference being had to the accompanying-drawings, which show, byway of example, the inshown at-SGS. i

'veIition adapted for use on a four digit-storingand sendingscheme from an operators key-sending position. 1 In order tofacilitate the understanding of the invention, Fig. ,2 shouldvbe placed to the right of Fig. 1, with the corresponding linesv in alignment.

In Fig. 1, DK represents the operators digit key strip,relays W, X, Y and Zthe first group ofstoring relayscarrying the necessary contact combinations and connec-' tions so that potential maybe applied to any of the terminals 1 to O'in accordance with the relays operated, to controlthe sending of the necessary digits; and ICS represents the input control switch whichiextends the operating'leads from the digit keys toea-ch of the storing-groups in turn.- It. will be clear lyunderstoodgthat if desired, the input controllswitch' .may be of the .relay switching type, in place of the rotary switch" type shown. In Fig.2,ythe second, third, and

fourth "storing'r'elay'groups are shown comprising relays W X 'Y ','Z W X Y Z and W XilYF, Z respectively. Also, a portion of the. sending 1 As soon as the equipment is in readiness to receive the call theioperator operates the digit keys in accordance with the desired subscriber7s number and it'w-ill be assumed, by

control switch is r way otrixample, that-this number is 3456. 1 r

The. operation of digit key: 3 extends earth over wiper 12 and first bank contactof the input control switch IGS, upper winding of relay Y, winding of relay DS to battery. Relays Y and DS operate inseries in this circuit, relay Y locking itselffrom battery, over its lower winding, armature 1a and front contact, conductor 15, first bank contact andwiper 31 of the sender control switch SCS, to earth, and relay DS energizingand completing the circuit of the magnet DM- of the input control switch ICS at armaturel6.

.VVhen thekey 3 is released, relay DS restores and allows themagnet DM to de-energ-izeand move the wipers on to the next bank contacts. 1 The operation of the next digit keyi; e. 4, extendsearthover'wiper 13v and second bank contact of the input control switch, conductor 17,-upper. winding of relay Z, conductor 18, winding of relay DS to battery. Relay Z operates in this circuit and locks itself at armature 19 to earth on a convenient holding conductor say for instance, conductor 46; relay DS energizes in series with relay Z and operates the magnet DM as before. The release of the key permits the magnet to restore and move the wipers forward one more step and when the next digit key 5. is operated, earthfis extended over wipers 10 and 11, and their third bank contacts, conductors 20 and 21, upper windings of relays W2 and X2, respectively, conductor 18, winding of relay DS to battery. Relays W2 and X2 energize in the two branches of this parallel circuit and lock energized over their lower windings at armatures 22 and 23, respectively, to earth on conductor 46, and relay DS, as before, effects the operation of the stepping magnet of the input control switch. Similarly, when the digit key 6 is operated, relays WV3 and Y3 operate over wipers 10 and 12 and the fourth bank con tacts and conductors 24 and 25 respectively, in parallel. These relays will operate and lock energized as before, and relay DS will again cause the magnet DM to operate to cause input control switch to step forward one step.

The operation of relay Y in the first stor ing relay group, Fig. 1, connects earth over conductor 26 to terminal 3, from armature 27 and back contact, armature 28, and back contact, armature 29. and front contact, arma- E ture 30 and back contact, conductor 26 to terminal 3, and this terminal will be connected to a part of the sending circuit so that sending will be stopped when three impulses have been sent. When the first digit, that is, the three impulses have been sent, the sender control switch is stepped once,by well known circuit methods notshown in the drawings, and the lockiugcircuit for the relays in the first storing group is opened. The relays in the first storing group which are operated therefore release, but as soon as the wipers of the sender control switch rest on their second bank contacts a circuit is again completed to operate relays in the first group, as isdetermined .by the operated'relays in the second group. As relayZ is operated in the second group, a circuit may be traced for relay Z of the first group, from earth, wiper 31 and second bank contact of the sender control switch SCS, conductor 32, armature 33 and front contact, conductor 34, lower winding of relay Z in the first storing group to battery. Relay Z operates and connects earth over conductor 35 to terminal 4. from armature 27 and back contact, armatures 28 and 29 and their respective back contacts, armature 36 and front contact, conductor 35 to terminal 4, which. terminal is connected to the sending. circuit so that sending is stopped when four impulseshave been sent.

When this series of impulses has been sent, the sender control switch SGS again steps one step, relay Z in the first relay group restores, and circuits are now completed to operate relays W and X from earth on wipers 51 and 52 and their third bank contacts, armatures 37 and 38 andfront contacts of relays W2 and X2 of the third group respectively, conductors 39 and 40 respectively, lower windings of relays W and X to battery. Earth is now connected over conductor 41 to terminal 5, from armature 27 and front contact, armature 42 and front contact, conductor 41 to terminal 5, so that the next series of impulses sent out will be 5. Similarly, after this series, the switch SCS again steps one step, relays W and X restore, and circuits are closed over wipers 51 and 53 for the re-operation of relay W' and the operation of relay Y over armatures 43 and-44C respectively of relays W3 and Y3, of the fourth group. Earth is therefore now extended over conductor 45,

to terminal 6, so that the next series of impulses which is sent out is 6. I f

After completion of sending the relaysin the second, third and fourth storing relay groups will be restored to normal by the opening of the common holding circuit, which it will be understood may be controlled by other suitable circuit features. a

From the foregoing description and the drawings itwill be appreciated that according to the present invention the large spring combinations necessary to control the digit to be sent need only be equipped on the relays in the first storing relay group, the remaining storing groups having only suflicient springs as is-necessary to control the operation of the first group relays.

What I'claim as new and desire to secure by Letters Patent is 1. In an arrangement for controlling the operation of an impulse sender, a plurality of relay groups, means for operating said relay groups in turn to record successive digits of a number, and means whereby one of said relay groups controls'theoperation of the sender to transmit, all the digits recorded.

2. In a register sender, a plurality of registers, means for setting said registers to record successive digits in a number,- means for restoring the first register after the digit recorded thereon has been transmitted, and means for automatically resetting said first register under control of the second register.

3. In a register sender, a plurality of registers, suflicient contacts on the first register for controlling the operation of an impulse sender, and contacts on the remaining registers for controlling the resetting of said first iregister. 7 I

4:. In a register'sender, a plurality of registers each comprising a plurality of relays,

means for setting the relays of said registers to record successive digits of'a number,- a

plurality of contacts on the first register for causing an impulse sender to transmit impulses corresponding to the digit recorded on said register, and means for resetting said first register in accordance with the digits recorded respectively on the remaining registers. I

5. In an arrangement for controlling the operation of an impulse sender, a plurality of relay groups, means for operating relays in said relay groups in turn to record successive digits of a number, means whereby one of said relay groups controls the operation of the sender to transmit all the digits recorded,'and means for restoring said last mentioned relay group and for resettingthe same between the transmission of successive digits. In testimony whereof I have signed my name at London, England, this 28th day of February, 1929.

PERCY FRANK GUNNING. 

